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About the only thing that may make a big difference is taller tires or taller gears. For example a 94-95 Dodge Dakota 5.2V8 4X4 will gain about .5 MPG going from 3.92 to 3.55 diffs and another .5 going from 3.55s to 3.23s. This on trucks getting 15-20 mpg. Less power off the line though as you move taller. Unless you are unlucky enough to move to a bad place in the power band a 5% taller tire will result in about 5% better gas mileage.
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Subvert the Dominant Paradigm
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